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The photo site The Luminous Landscape just ran a recap column following a recent Antarctic photo expedition. There was a total of 26 5D MkII's in use by participants and of those, about 25% suffered some sort of failure with many probably due to condensation or moisture. No other camera model exhibited this sort of failure rate. The conditions were described as generally no worse than a drizzly winter day. I guess Canon makes no claims of weather sealing on the 5D MkII, but it may be something to be aware of. I am a Canon user, so this isn't intended to start a flame war or anything, just wanted to pass this info along.

The photo site The Luminous Landscape just ran a recap column following a recent Antarctic photo expedition. There was a total of 26 5D MkII's in use by participants and of those, about 25% suffered some sort of failure with many probably due to condensation or moisture. No other camera model exhibited this sort of failure rate. The conditions were described as generally no worse than a drizzly winter day. I guess Canon makes no claims of weather sealing on the 5D MkII, but it may be something to be aware of. I am a Canon user, so this isn't intended to start a flame war or anything, just wanted to pass this info along.

Probably just lucky, but I've even been surprised and pleased that my "lowly" XTi and lenses have come through some soggy encounters, the worst being a week at Laguna San Ignacio in Baja California. Spent several days on the water in small boats with splashing and exhaling gray whales. No direct hits of course, but lot's of handling with wet hands and spray. Did my best to keep it dry or at least dried off without ill effect. On the first day, I did try to use a lightweight rain cover, but it just got in the way.

Originally Posted by michaelb

I've never had any issues with any of my Canon bodies and I shoot in crappy New England weather frequently, although I do so with common sense.